Notes:
Volumes 1-17 (1st printing) were published under the Feest Comics imprint.
Volumes 18-24 (1st printing) were published under the Feest Manga imprint.
Volumes 25-36 and the reprints were published under the EMA imprint.

The German publication history of Ranma 1/2 is also a little bit colorful.
The series first appeared in the short-lived manga anthology Manga Power (1st series). After aquiring Shogakukan for films from which Ehapa could reproduce their editon they were referred to Viz. At Viz they obvious couldn't care less about the needs of a German publisher and simply told them to scan the pages of Viz' own edition - which Ehapa was forced to do and produced six issues of "Manga Power" on abysmal quality from 1996 to 1997 (the translations were also very poor.
The "Ranma" parts of "Manga Power" were reprinted and continued in a tradepaperback series that also lasted only 4 volumes in 1997.
When manga really took of with "Sailor Moon" on TV and Carlsen publishing the "Dragon Ball" manga, Ehapa published the series once more. This time as tankobon and with better quality (thanks to the French) but also mirrored. Which is the version we are stuck to this very day.